DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices
General Description
The DS9481R is a USB-to-1-Wire
M
adapter for easy PC
connectivity to 1-Wire devices. The adapter provides an
RJ11 connector with the signals to communicate with all
1-Wire and iButton
M
devices that support a 3.3V data I/O
level. Additionally, the adapter provides the support and
signaling to program 1-Wire/iButton EEPROM and one-
time programmable (OTP)/EPROM devices. To provide
a total hardware solution, the DS9481R can readily be
used with the DS9120 socket adapter to create a 1-Wire
PC programmer for 1-Wire slave devices (contact factory
for more information). The equivalent slave hardware
solution for the iButton is the DS1402D-DR8.
Features
S
Driver Support for Windows
®
7, Windows Vista
®
,
and Windows XP
®
Operating Systems
S
Enumerates as a Virtual PC COM Port by Use of
the Prolific PL-2303HXD USB-to-UART Bridge IC
S
Emulates the DS2480B 1-Wire Line Driving
Functionality
S
1-Wire OTP/EPROM Programming Provided
Without the Need of an External Power Supply
(12V on OW, 7V on PULSE)
S
3.3V Read/Write Operation to 1-Wire/iButton
Devices
S
RJ11 Interface for Standard Connectivity
Accessories such as the DS9120 Socket Adapter
S
Supports Standard and Overdrive 1-Wire
Communication
S
Provides Strong Pullup to 3.3V
S
Fully Compliant with USB 2.0 Specification
S
Windows XP Certified Logo Drivers
Adapter Contents
QTY
1
1
DESCRIPTION
USB-to-1-Wire adapter
Maxim DS9481R-3C7+
USB Type A-to-USB Mini-Type B cable
Qualtek Electronics Corp. 3021003-03
Ordering Information
PART
TYPE
DS9481R-3C7+
Adapter
+Denotes
lead(Pb)-free and RoHS compliant.
DS9481R USB-to-1-Wire/iButton Adapter
1-Wire and iButton are registered trademarks of Maxim
Integrated Products, Inc.
Windows, Windows Vista, and Windows XP are registered
trademarks of Microsoft Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5608; Rev 0; 10/10
DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices
Component List
DESIGNATION
C1, C6, C21
QTY
3
DESCRIPTION
4.7FF, 16V Y5V ceramic
capacitors (0805)
TDK Corp. C2012Y5V1C475Z
2.2FF, 16V Y5V ceramic
capacitors (0805)
Murata GRM21BF51C225ZA01L
0.22FF
Q10%,
16V X7R ceramic
capacitors (0603)
TDK Corp. C1608X7R1C224K
10nF ±5%, 16V X7R
ceramic capacitors (0603)
AVX 06035C103JAT2A
0.1FF, 16V X7R ceramic
capacitors (0603)
KEMET C0603C104K4RACTU
10FF, 10V Y5V ceramic
capacitor (0805)
TDK Corp. C2012Y5V1C106Z
Do not populate,
470pF ceramic capacitor (0603)
1FF, 10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107B7105KA-T
10pF, 16V NP0 ceramic
capacitor (0603)
TDK Corp. C1608C0G1H100D
Do not populate, capacitors
USB Mini-AB connector,
right-angle, SMD, 5-position
JAE Electronics
DX3R005HN2E700
30V, 200mA Schottky diode (SOT23)
Diodes Inc./Zetex BAT54TA
15V, 350mA zener diode (SOT23)
Diodes Inc. MMBZ5245B-7-F
Orange LED (TSS type) (0603)
Panasonic/SSG LNJ812R83RA
Dual CC Schottky diode (SOT23)
Diodes Inc./Zetex BAT54CTA
R7, R14, R26
3
DESIGNATION
FB1, FB2
QTY
2
DESCRIPTION
220W, 2000mA ferrite chips (0805)
Murata BLM21PG221SN1D
6-position, right-angle, PCB-
mounted jack
Tyco 5520425-3
Do not populate,
JTAG connector
130mA, 50V p-channel MOSFETs
(SOT23-3)
Fairchild Semiconductor BSS84
115mA, 60V n-channel MOSFETs
(SOT23)
Diodes, Inc. 2N7002-7-F
3.9A, 20V p-channel MOSFET
(SOT23)
NXP PMV65XP,215
Do not populate,
resistors
27I
Q1%,
1/10W SMD resistors
(0603)
Yageo RC0603FR-0727RL
1.5kI
Q1%,
1/10W SMD
resistors (0603)
Panasonic ECG ERJ-3EKF1501V
10kI
Q1%,
1/10W SMD
resistors (0603)
Yageo RC0603FR-0710KL
1kI
Q1%,
1/10W SMD
resistors (0603)
Yageo RC0603FR-071KL
100kI
Q1%,
1/10W SMD
resistors (0603)
Yageo RC0603FR-07100KL
750I
Q5%,
1/10W SMD
resistor (0603)
Yageo RC0603FR-07750RL
0I
Q1%,
1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3GEY0R00V
J1
1
C2, C3
2
J2
0
C4, C7
2
Q1, Q3
2
C5, C15, C22
3
Q2, Q4, Q5, Q7
4
C8, C11-C14,
C20, C23
7
Q6
1
C10
1
R1, R29
0
C16
0
R2, R3, R5
3
C17
1
R4, R16, R21
3
C19
C9, C24, C25
1
0
R6, R24
2
CN1
1
R8, R13, R17,
R20, R27, R30
5
D1
D2
D3
D4
1
1
1
1
R9
1
R10
1
2
Maxim Integrated
DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices
Component List (continued)
DESIGNATION
R11
QTY
1
DESCRIPTION
33I
Q1%,
0.1W SMD
resistor (0603)
Rohm MCR03EZPFX33R0
4.99I
Q1%,
1/10W SMD
resistors (0603)
Yageo RC0603FR-074R99L
2.2kI
Q5%,
1/10W SMD
resistor (0603)
Stackpole Electronics RMCF
1/16 2.2K 1% R
51kI
Q0.1%,
1/10W SMD
resistor (0603)
Panasonic ECG ERA-3AEB513V
11kI
Q0.1%,
1/10W SMD
resistor (0603)
Vishay/Dale
TNPW060311K0BEEA
10I
Q1%,
1/10W SMD
resistor (0603)
Yageo RC0603FR-0710RL
32.4kI
Q1%,
1/10W SMD
resistor (0603)
Vishay/Dale
TNPW060332K4BEEA
30.1kI
Q0.1%,
1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3EKF3012V
50kI
Q1%,
1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3EKF4992V
0.12A, 30V PTC resettable fuse
(1206)
Bourns MF-NSMF012-2
U2
1
DESIGNATION
SW1
QTY
0
DESCRIPTION
Do not populate, switch
Low-dropout, 300mA linear
regulator (5 SOT23)
Maxim MAX8887EZK33+T
(Top Mark: ADPZ)
12V, 30mA Flash memory
programming supply (8 SO)
Maxim MAX662ACSA+
TinyLogic
M
UHS inverter
(5 SOT23)
Fairchild NC7SZ04M5X
Do not populate,
Silicon oscillator (3 SC70)
Maxim MAX7381AXR126-T
USB-to-serial bridge controller
(28 SSOP)
Prolific PL-2303HXD SSOP
16-bit microcontroller with infrared
module (32 TQFN-EP*)
Maxim MAXQ610A-9410+
2-channel ESD protector (6
FDFN)
Maxim MAX13204EALT+
(Top Mark: BV)
High-voltage, low-power linear
regulators (5 SOT23)
Maxim MAX1616EUK+
(Top Mark: ABZD)
1.8V comparator (5 SOT23)
STMicroelectronics TS3021ILT
PCB: DS9481R REV A3
U1
1
R12, R15, R22
3
R18
1
U3
1
R23
1
U4
0
R25
1
U5
1
R28
1
U6
1
U7
1
R31
1
U8
1
R32
1
U9
—
1
1
R33
1
*EP
= Exposed pad.
TinyLogic is a registered trademark of Fairchild Semiconductor.
RT1
1
Maxim Integrated
3
DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices
Quick Start
• Maxim DS9481R (included in adapter)
2) Do the following to install the 1-Wire drivers:
a) Go to the 1-Wire Drivers—Getting Started
webpage at
www.maximintegrated.com/1-
wiredrivers.
b) Click on the
Click to go to Download Page
button.
c) From the
Choose Operating System
drop-down
list, select your OS.
d) From the
Select File
drop-down list, select 32-bit
or 64-bit 1-Wire drivers for the architecture being
used by your OS.
e) Click the
Download
button.
f)
When prompted by the question
Do you want to
run or save this file?,
select
Run.
Recommended Equipment
• USB type-A to USB Mini type-B cable (included in
adapter)
• RJ11 cable assembly (not included)
• PC with a Windows 7, Windows Vista, or Windows XP
OS and a spare USB port
Note:
In the following sections, software-related items
are identified by bolding. Text in
bold
refers to items
directly from the adapter software. Text in
bold and
underlined
refers to items from the Windows operating
system.
1) Do the following to install the PL-2303HXD Prolific driver:
Procedure
g) When you get a security warning that says
Do
you want to run the software?,
select
Run.
h) Read and check the box if you accept the
license agreement and click
Install.
i)
Click the
Finish
button to exit the Setup Wizard.
3) The DS9481R USB-to-1-Wire adapter uses both the
Prolific PL-2303HXD and the Maxim MAXQ610 to
emulate a virtual COM-to-1-Wire port on any PC. Find
the enumeration of the virtual COM port by inserting
the DS9481R into a spare USB port on the com-
puter. Determine the COM port by looking in
Control
Panel→System→Hardware→Device Manager
and
a) Download either the driver file called PL2303_
Prolific_DriverInstaller_v130.ZIP or the latest
version from http://www.prolific.com.tw/eng/
downloads.asp?ID=31.
b)
Open
and
Run
either the file called PL2303_
Prolific_DriverInstaller_v110.EXE or the latest
version.
c) Follow the directions of the
Install Wizard
until
Finish
is reached for the PL-2303 USB-to-serial
driver installation. Close by clicking the
Finish
button.
Figure 1. DS9481R USB-to-1-Wire/iButton Adapter and Cable
4
Maxim Integrated
DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices
expand
Ports (COM & LPT).
The port is COM2 in the
example shown in Figure 2.
You have now completed the installation of the DS9481R
adapter. Obtain the adapter software and directions
for installation for your 1-Wire/iButton slave device
by contacting Maxim online technical support at
https://support.maximintegrated.com/1-Wire.
Detailed Description of Connectors
Table 1 and Figure 3 show the RJ11 pinout mounted on
the DS9481R PCB at J1. The RJ11 pin 1 can supply 3.3V
and can be used for auxiliary board power. The GND is
the ground of the 3.3V supply. The signal OW (DATA)
stands for the 1-Wire data bus. The ground return for OW
(DATA) is the signal OWGND. The PULSE signal is to
be used as the VCC power supply for OTP 1-Wire slave
parts. The PULSE signal is typically 3.3V, but also can
provide the needed programming pulse for OTP parts.
The GP signal is reserved for future general-purpose
usage and is functionally not used by the DS9481R.
The 5-position Mini-USB type AB connector is mounted
at CN1 of the DS9481R PCB, as shown in Table 2.
RJ11 Pinout
Mini-USB Pinout
Figure 2. DS9481R COM Port
Hardware/Firmware Capabilities
The DS9481R uses both the Prolific PL-2303HXD and
the Maxim MAXQ610. The PL-2303HXD is fully compli-
ant with USB 2.0 specification for Windows 7, Windows
Vista, and Windows XP OS and provides a bridge for the
USB-to-UART connection. The MAXQ610 is loaded with
firmware that emulates the functionality of the DS2480B
serial-to-1-Wire line driver at a lower 3.3V operation
voltage. The MAXQ610 functions as a UART-to-1-Wire
bridge and can serve custom application needs with
firmware programmability.
6
5
4
3
2
1
LOOKING INTO FEMALE RJ11 CONNECTOR
Figure 3. 1-Wire RJ11 Port
Table 1. 1-Wire RJ11 Pinout
CONNECTOR PIN
1
2
3
4
5
6
SIGNAL NAME
3.3V
GND
OW (DATA)
OWGND
PULSE
GP
Table 2. Mini-USB Type AB USB Pinout
CONNECTOR PIN
1
2
3
4
5
6-9
SIGNAL NAME
5.0V
DMCN
DPCN
NC
GND
GND_EARTH
Maxim Integrated
5
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